I see you but they don't

A small black cat
Who is mean
She says it would be better for me to die
Jump off a building
That I am worthless
A white haired girl, Lucy
Tells candy to leave
But is only nice sometimes
Why do my brothers
not hear you threaten me
Why do my parents
not hear Lucy's jokes
And her insults geek, bitch, idiot, brat
Why do they torture me
Why do they tell me to hurt people
Who do I see them
Who don't you?